ci: upgraded actions/setup-python to v5

Author: ErikBjare

.github/workflows/build.yml

@@ -20,7 +20,7 @@ jobs:
       with:
         submodules: 'recursive'
     - name: Set up Python
-      uses: actions/setup-python@v1
+      uses: actions/setup-python@v5
       with:
         python-version: ${{ matrix.python_version }}
     - name: Create virtualenv